Sensor of a heart rate belt



FIG. 1 is a top, rear perspective view of a sensor of a heart rate belt.

FIG. 2 is a front perspective view of the sensor of FIG. 1; and,

FIG. 3 is a rear perspective view of the sensor of FIG. 1.

The dash-dot lines in FIGS. 1 through 3 see at the ends of the sensor of a heart rate belt and in the unclaimed central oval portion of the sensor of a heart rate belt define the boundaries of the claimed design. 

We claim the ornamental design for a sensor of a heart rate belt, as shown and described. 